Spindle press drive



Aug. 26, 1941. w CHLADEK AL 2,254,029

SPINDLE PRESS DRIVE Filed Nov. 16,1938

WITNESSES: INVENTORS M Wilhelm Chlaa'ek qmd M I z/osef GaZZer Patented Aug. 26, 1941 SPINDLE PRESS DRIVE Wilhelm Chladek, Berlin-Panko'w, and- Josef Galler, Berlin-Spandau, Germany,- assi gnors to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of Pennsylvania Application November 16, 1938, Serial No. 240,723

In Germany February 5, 1938 8 Claims. (01. 192-144 Our invention relates to a drive for a machine press, such as, for example, a spindle press and to a control system for such drive,

An object of our invention is to provide a drive for a machine press, such as, for example, a spindle press in which the spindle is in permanent driving engagement with a reversible motor.

Another object of our invention is to provide a control system for said reversible motor such that the spindle press will automatically move upwardly after it has completed its downward movement.

Another object of our invention is to provide a control system for said reversible motor such that release of the start button for said system before the stamp press has completed its downward movement will effect stopping of said downward movement and automatic reversal of said motor, thereby effecting an upward movement of the stamp press.

Other objects and advantages will become more apparent from the study of the following specificationwhen considered in conjunction with the accompanying drawing.

The. upward and downward movement of the press stamp in machine presses, such as, for eX- ample, spindle presses, has heretofore been effected by providing the spindle with a disk on which a friction wheel presses from above or from below in accordance with the direction it is desired that the spindle should rotate. This type of. drive for reversing the direction of spindle rotatiori is comparatively complicated, and since it causes comparatively rapid wear of the friction wheels; gives rise to frequent delay.

Our invention removes these deficiencies by a radical departure from the present types of drives. Our invention embodies a drive We reversible motor which is continuously coupled with the spindle.

I In the drawing, the single figure of which shows an embodiment of our invention, the reference character I denotes the frame of a spindle press which has a press stamp 2 which is moved up and down by a spindle 3 which is screw threaded to said press stamp. The spindle 3 may be set into rotation by a reversible motor 4 which is continuously coupled, through gears 60 and-6|,-

becomes energized thus causing the switch 6 to close, motor 4 rotates in an opposite direction and, accordingly, moves the press stamp 2 downwardly; The direction in which the press stamp 2 moves whenthe switches 5 and'fi are-closed is indicated by the arrows9- and I0, respectively,

disposed 'adjacent'the relays I and 8, respectively,

switch 5 to close,'the motor 4 sets the spindle 3 into rotation causing an upward movement of the press stamp 2; on the other hand, if relay 8 to facilitate the understandingof the circuit. The essential control and switching elements of the illustrated control system further include a setup? 'relay'l I, the energization of which is controlled by a .set up pushbutton switch I2, two switches I3 and I4 movable in accordance with the movement of the :press stamp '2, and finally a ,start pushbutton control switch 15. A main'switch I6 serves to disconnect; the whole system in case where necessity therefor arises. The control device, as such, may also be denergized by pressing down a stop pushbutton switch II. I

The operation-of the device is as follows: If theipress stamp. 2 is to be set into motion, then first of all the fset upFpushbutton switch I2 must be pressed, By this a circuit is, closed which, assuming that the switchesjlfi and I! are closed, may be traced from the bus I8. through conductors l9 and 20, the magnet coil of relay ll, conductor 2|, bridged contact elements 22 and 23 of the switch I4, conductor 24, the bridged contact elements 25 and-26' of pushbutton switch I 2, conductor 21, the bridged contact elements 28 and 29 of ,the relay 1', conductor 30,- and finally switch l'IV-to the bus 3| The energization of relay causes the bridging of interlock contact members 32 and 33, ,also the bridging-of .setup contact members 34 and 35. By the bridging of the interlock contact-members 32 and-33, a shunting of the pushbutton switch [2 is effected by which relay ll remainsenergized even though pushbutton switch 12 is released, allowing the opening thereof by its spring.

By the'bridgingof contact members 34 and 35, a preparatory or set-up'circuit is completed so that the driving motor will be startedjust as soon as the start pushbutton switch I5 is pressed. When-the start pushbutton switch I5 is pressed, relay8 is energized effecting the closing. of switch 6. The circuit which is completed by. the pressing of start pushbutton switch [5' may be traced from thebus I8 through conductors I9 and 38, the magnet coil of relay 8, conductor 31, bridged contact members 38 and 39 of relay I, conductor 40, contact members 34 and 35 of relay II, conductor 4|, bridged contact members ll and 43 of the pushbutton switch I5, stop pushbutton switch I! to the bus 3|. The closing of switch 6 will effect starting of the motor 4 and a downward movement of press stamp 2. After the press stamp 2 has moved downwardly a predetermined amount, that is, as soon as roller 44 runs ofi cam 45, limit switch member I 3 is moved to the right by its spring thus bridging contact members 45 and 41, but this bridging of contact members 464| has no immediate effect.

Now assume that while press stamp 2 is moving downwardly, in an abnormal operation of the device, as in a case of danger, that the start pushbutton switch I5 is released before press stamp 2 has completed its downward movement, thus permitting the spring and bridging element of start switch l5 to open the circuit between contact members 42 and 43 and to close the circuit between contact members 48 and 49, then by reason of the interruption of the circuit through the electromagnet coil of the. relay 8. and the interruption of the circuit atv contact members 42 and 43, relay 8 is immediately again returned to the position shown in the drawing. Switch 6 is thus opened and the motor is disconnected from the power source. Simultaneously, however, a circuit through relay 1 is closed. The circuit for this relay may be traced from bus 3|, pushbutton switch l1, contact members 48 and 49 of the pushbutton switch l5, conductor 50, bridged contact members 46 and 41 of switch l3, conductor 5|, bridged contact members 52 and 53 of relay 8, conductor 54, the actuating coil of relay 1, conductors 55, 20 and is to the bus l8. Relay 1 is thus energized effecting the closure of switch 5 which, in turn, causes reversal of the direction of rotation of the motor, so that the press stamp 2 will now move upwardly corresponding to the direction given by arrow 9. In other words, if,

during the operation of the machine, any dangerarises, as a result of which the operator through fright or otherwise releases the pushbutton switch l5, the downward movement of the press stamp 2 is at once arrested and the press stamp, in the next instant, is moved upwardly. After stamp press 2 has moved upwardly a predetermined amount, roller 44 will ride on cam 45, opening limit switch I3, thus interrupting the circuit through electromagnetic coil 1' which in turn opens switch 5 and stops the motor.

If, as in a normal operation, the pushbutton switch I5 is pressed and held that way without interruption during the downward movement of the press stamp, then after the switch l3 has closed as the result of roller 44 moving off cam 45, limit switch M will be actuated by the downward movement of press stamp 2 by a similar roller and cam arrangement causing opening of the circuit between contact members 22 and 23 and bridging of contact members 56 and 51. The unbridging of limit switch contact members 22 and 23 effects an interruption of the circuit through the magnet coil of the auxiliary relay ll, causing the opening of the circuit through the contact members 34 and 35 in which circuit the electromagnetic coil of relay 8 is connected also the opening of the interlock circuit through contact member 3435'. The d'eenergization of relay 8 causes the opening of switch 6 and the stopping of motor 4. Briefly, the unbridging of contact members 22-23 stops the downward movement of the press stamp and at the same time interrupts the set up circuit. By the bridging of the contact members 56 and 51 which immediately follows, a circuit is closed. through the electromagnetic coil of relay 1, extending from bus 3|, switch l'l, conductor 58, contact members 55 and 51 of switch I4, conductors 59 and 63, the bridged contact members 46 and 41 of switch it, conductor 5|, the bridged contact members 52 and 53 of relay 8, conductor 54, the electromagnetic coil of relay 1, conductors 55, 20 and finall Is to the bus H3. The energization of relay I causes the closing of switch 5 so that the motor 4 from this instant onward sets the spindle 3 in rotation in an opposite direction so as to effect an upward movement of the press stamp 2. If the press stamp 2 moves upwardly, roller 44 of the switch 33 will be eventually guided to the left unbridging contact elements 4641 of switch 13 so that the above-described circuit, in which the electromagnetic coil of relay 1 is connected, will be opened, and, in turn, switch 5 will be opened. The driving motor 4 is thus stopped in the position shown in the drawing. In the course of the upward movement of the press stamp, the switch I4 also assumes the position shown in the drawing in which contact members 22 and 23 are bridged. The bridging of these contact members 22, 23, however, at this instant, has no effect, since the holding circuit for the auxiliary relay II has already been interrupted by the unbridging of contact members 3233. Since relay II is now deenergized, a pressing of the start pushbutton switch l5 up until the instant at which the contact elements 22 and 23 of the switch are again bridged cannot initiate a new cycle comprising an upward and downward movement of the press stamp 2. After each cycle of operation, it is always necessary that the set-up or auxiliary relay be again brought into the operating (energized) position by pressing the set-up. pushbutton switch I2 before the start, pushbutton is pressed.

A particular characteristic of the described circuit is that once the downward movement of the press stamp is started and the start. pushbutton is continuously held down, the press stamp can move through only one cycle of operation; that is to say, move only once downwardly and once upwardly, and that before a new operation can be started, there must first be provided a new starting impulse by pressing set-up pushbutton switch l2. Another important characteristic of the system is that upon release of the start pushbutton l5 during the downward movement of press stamp 2, as in case of danger, the downward movement of the press stamp is at once arrested and is immediately followed by an upward movement thereof.

We are, of course, aware that others, particularly after having had the benefit of the teachings of our invention, may devise other machine press drives and other control systems therefor embodying our invention and, therefore, we do not wish to be limited to the specific showings made in the drawing and the descriptive disclosure hereinbefore made, but wish to be limited only by the scope of the appended claims and such prior art that may be pertinent.

We claim as our invention:

1. In a machine press, in combination, a press stamp, a reversible motor and an electric power source therefor, means exclusive of clutch means providing a permanent driving connection between said motor and said press stamp, circuit means including a start switch which, upon pressing thereof, completes a starting circuit, starts said motor, thus eirecting downward movement of said press, a second circuit meansincluding asecond switch which is actuated by said press stamp and which automatically reverses saidmotor after said press stamp has moved downwardly a predetermined amount and a third circuit means including still another switch which is actuated by said press stamp after the latter has completed its upward movement, which last mentioned switch interrupts said power source and stops said motor. w

- 2. In a machine'press, in combination, a press stamp, a single reversible motor for effecting reciprocation of said press stamp and aneIectric power source therefor, means exclusive of clutch means for providing a'permanent driving connection between said motor andsaid press stamp; circuit means including a set-up switch the closing of which switch partially completes a starting circuit, a start switch which, r upon pressing, completes said starting circuit, starts said motor, thus effecting downward movement of said stamp press after it, a second circuit means actuated by said press stamp has moved downwardly a predetermined amount and which effects reversal of said motor, thus eifecting an upward movement of said press stamp, and a third circuit means including a switch Which is actuated by said press stamp after said press stamp has moved upwardly a predetermined amount and which switch interrupts said power source and stops said motor, and means which interrupts said starting circuit and makes the subsequent closing of said start switch ineffective to restart the motor until the set-up switch has been previously closed.

3. In a machine press, in combination, a press stamp, a single reversible motor for effecting reciprocation of said press stamp and an electric power source therefor, means exclusive of clutch means providing a permanent driving connection between said motor and said press stamp, circuit means including a start push button switch which, upon pressing, completes a starting circuit, starts said motor, thus effecting downward movement of said stamp press, a second circuit means actuated by the release of said start pushbutton which, if said stamp press has not completed its downward movement, will interrupt the starting circuit, stop said motor and effect a reversal of said motor, thus moving said press stamp upwardly.

4. In a machine press, in combination, a press stamp, a single reversible motor for eifecting reciprocation of said press stamp and an electric power source therefor, means exclusive of clutch means providing a permanent driving connection between said motor and said press stamp, circuit means including a set-up" switch, the closing of which partially completes a starting circuit, a start switch, the closing of which completes said starting circuit effecting the starting of said motor and downward movement of said press stamp, a second circuit means actuated by said press stamp after the press stamp has completed its downward movement and which automatically reverses said motor thus effecting an upward movement of said press stamp, and a third circuit means including a switch which is actuated by said press stamp after said press stamp has moved upwardly a predetermined amount and which switch interrupts said power source and stops said motor, and means which interrupts said starting circuit and makes the subsequent closing of said start switch ineffectiveftorestart the motor until the set-up switch has been previously closed.

'5. Ina machine press, in combination, a press stamp, a single reversible motor for effecting reciprocation'of saidpress stamp and an electric power sourcetherefor, means exclusive of clutch means providing a permanent driving connection between said motor and said press stamp, circuit -means including a set-up relay which relay comprises an electromagnetic coil, a pair of interlock contact members and a pair of set-up contact members, circuit means including said set-up switch, which, when closed, will efiectenergization of said electromagnetic coil thereby'closing said interlock and set-up contact members, thus closing an interlock circuit which hunts said set-up switch and closing a set-up circuit which forms a partial starting circuit, respectively,a start switch which, when closed, completes said starting circuit, starts said motor and effects downward drive of .said press stamp, a switch which is operable by said press stamp after said press stamp has moved downwardly a predetermined amount and the opening of which switch effects deenergization of said set-up relay and opening of said interlock circuit and of said set-up circuit, a second switch which is adapted to be closed by said press stamp immediately after said first switch has been opened, said second switch, upon closing, completing another circuit which effects interruption of said downward drive and a reversal of said motor thus effecting an upward drive of said stamp press.

6. In a machine press, in combination, a press stamp, a single reversible motor for effecting reciprocation of said press stamp and an electric power source therefor, means exclusive of clutch means providing a permanent driving connection between said motor and said press stamp, circuit means including a "set-up relay which relay comprises an electromagnetic coil, a pair of interlock contact members and a pair of set-up contact members, circuit means including said set-up switch, which, when closed, will effect energization of said electromagnetic coil thereby closing said interlock and set-up contact members, thus closing an interlock circuit which shunts said set-up switch and closing a set-up circuit which forms a partial starting circuit, respectively,a start switch which, when closed, completes said starting circuit, starts said motor and effects downward drive of said press stamp, a switch which is operable by said press stamp after said press stamp has moved downwardly a predetermined amount and the opening of which switch effects deenergization of said set-up relay and opening of said interlock circuit and of said set-up circuit, a second switch which is adapted to be closed by said press stamp immediately after said first switch has been opened, said second switch, upon closing, completing another circuit which effects interruption of said downward drive and a reversal of said motor thus effecting an upward drive of said stamp press, a limit switch which is actuated by said press stamp after the latter has completed its upward movement and which effects deenergization and stopping of said motor. '7. In a machine, in combination, a press stamp, a single reversible motor for effecting reciprocation of said press stamp and an electric power source therefor, means exclusive of clutch means providing a permanent driving connection between said motor and said press stamp, circuit means including three relays, the first of which, when energized, effects the partial'completion of a starting circuit for said motor, the second relay, when energized efiects downward movement of said press stamp, and the third relay, when energized, effects upward movement of said stamp press,a set-up switch, which, upon closing, completes a circuit through said first relay, a start switch, which upon closing, completes said starting circuit through said second relay, and a further switch which is adapted to be actuated by said press stamp'after the downward movement of the latter has been completed to deenergize said first relay and to energize said third relay, thus effecting reversal of the movement of said press stamp.

8. In a machine, in combination, a press stamp, a single reversible motor for effecting reciprocation of said press stamp and an electric power 1 source therefor, means exclusive of clutch means providing a permanent driving connection between said motor and said press stamp, circuit meansincluding three relays, the first of which, when energized, effects the partial completion of a starting circuit for said motor, the second relay, when energized eflects downward movement of said .press stamp and the third relay, when energized, effects upward movement of said stamp press, a set-up switch, which, upon closing, completes a circuit through said first relay, a start switch, which, upon closing, completes said starting circuit through'said second relay, and a further switch which is adapted to be actuated by said press stamp after the downward movement of the latter has been completed to deenergize said first relay and to energize said third relay, thus effecting reversal of the movement of said press stamp, and a limit switch which is adapted to be actuated by said press stamp after its upward movement has been completed eflecting deenergization and stopping of said motor.

WILHELM CHLADEK. JOSEF GALLER. 

